$ git clone -n https://src.fedoraproject.org/rpms/nginx.git /var/lib/mock/f39-build-1532365-36223/root/chroot_tmpdir/scmroot/nginx
Cloning into '/var/lib/mock/f39-build-1532365-36223/root/chroot_tmpdir/scmroot/nginx'...
$ git fetch origin 4aa5353117757923f717fc61263770c7fdc74581:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nginx
 * [new ref]         4aa5353117757923f717fc61263770c7fdc74581 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4aa5353 Related: #2224582 - Running nginx with systemctl and entering ssl private key's pass phrase